Castor oil and commercial thermoplastic polyurethane membranes modified with polyaniline: a comparative study

Júnior, José Humberto Santos Almeida; Bertuol, Daniel Assumpção; Meneguzzi, Álvaro; Ferreira, Carlos Arthur; Amado, Franco Dani Rico

doi:10.1590/s1516-14392013005000068

Cited by 29 publications

(14 citation statements)

References 33 publications

(34 reference statements)

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“…Solvents used to dissolve TPU must be highly polar organic solvents. Currently, several solution systems, mainly composed of 1,1,1,3,3,3,-hexafluoro-2-propanol (HFIP) [12], N,N-dimethyl acetamide (DMAC) [13], dimethyl sulfoxide (DMSO) [13], DMF [14][15][16], DMF/ ethyl acetate [17] or DMF/THF [17][18][19][20], are used for preparing electrospun TPU nanofibers. The effects of several of the above solutions on the resultant TPU nanofibers have been investigated by Mondal [13] and Cay et al [17].…”

Section: Of 12mentioning

confidence: 99%

A Solvent System Involved Fabricating Electrospun Polyurethane Nanofibers for Biomedical Applications

Liu

Wei

et al. 2020

Polymers

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A novel Trichloromethane (TCM)/2,2,2-Trifluoroethanol (TFE) solvent system was developed for fabricating electrospun thermoplastic polyurethane (TPU) nanofibers. TPU solution stability made from this novel solvent system was improved compared to that from the traditional N, N-Dimethylformamide (DMF)/Tetrahydrofuran (THF) solvent system. The minimum TPU solution concentration that can be electrospun was decreased to 0.5% w/v. The conductivity and viscosity of the TPU solution increased with the increasing ratio of TFE in the solvent system. The obtained electrospun TPU nanofibers fabricated from this novel solvent system showed smooth morphology and uniform diameter distribution. Mechanical strength of TPU nanofibers was improved using this new solvent system. Young’s modulus and tensile strength of the electrospun TPU nanofiber meshes first decreased and then increased, while the strain elongation ratio first increased and then decreased. The new solvent system significantly improves the fiber elongation ratio while maintaining the modulus and tensile strength. The chemical structure of the TPU was not affected by the TCM/TFE solvent system. Electrospun TPU nanofiber meshes prepared by using the TCM/TFE solvent system showed better cytocompatibility, which means the electrospun TPU fibrous scaffold has great potential in biomedical application.

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Section: Of 12mentioning

confidence: 99%

A Solvent System Involved Fabricating Electrospun Polyurethane Nanofibers for Biomedical Applications

Liu

Wei

et al. 2020

Polymers

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“…Among conventional polymers, thermoplastic polyurethanes (PU) show good mechanical properties, such as stiffness and flexibility. [ 16 ] Nazemidashtarjandi et al [ 14 ] studied the impact of PU on the efficiency of the PC membrane in a membrane bioreactor (MBR) for wastewater treatment. They concluded that PU acted as a pore former and improved the toughness of the PC membrane.…”

Section: Introductionmentioning

confidence: 99%

Effect of alumina nanoparticles on the antifouling properties of polycarbonate‐polyurethane blend ultrafiltration membrane for water treatment

Etemadi

Afsharkia

Zinatloo-Ajabshir

et al. 2021

Polymer Engineering & Sci

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In this work, the flexibility of polycarbonate (PC) membrane was improved by using polyurethane (PU) additive. However, due to the hydrophobic nature of the PU polymer, alumina (Al2O3) nanoparticles were incorporated to PC‐PU blend membrane. The prepared membranes have been used in a submerged membrane system to eliminate humic acid molecules from polluted water in both the presence and absence of coagulant (polyaluminum chloride). The obtained results showed that introduction of PU into PC membrane diminished hydrophilicity and enhanced porosity. Moreover, the flexibility of the PC membrane remarkably improved. Introduction of 1.5 wt% Al2O3 to the PC‐PU blend membrane led to enhancement in both porosity and hydrophilicity. Results of morphological studies showed that in the presence of Al2O3 nanostructures, finger‐shaped voids seemed to elongate across the entire thickness of the prepared membrane. Atomic force microscopy images showed that incorporation of PU and Al2O3 to the PC membrane resulted in a smoother surface. The antifouling performance of membranes revealed that the PC‐PU/Al2O3 nanocomposite membrane possessed the most favorable antifouling features owing to its lowest surface roughness as well as highest hydrophilicity. For all membranes utilizing coagulant (PAC), the irreversible fouling ratio and the flux recovery ratio significantly diminished and increased, respectively.

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“…Polymeric membranes have attracted much attention because of their unique advantages in the fields of biotechnology, food industry, water treatment and fuel cells [ 1 , 2 , 3 , 4 , 5 ]. There are various kinds of polymer membranes available, i.e., pure polymer, blend, mixed matrix, polyelectrolyte, composite, organic-inorganic hybrid, etc., and which are nonionic, ionic, or complex in nature, to meet day-to-day challenges [ 6 , 7 , 8 ]. Recently, castor oil-based polyurethane and polyaniline membranes have been used for the application of separation technology [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Polyelectrolyte Membranes of Pectin Graft-Copolymers with PVA and Their Composites with Phosphomolybdic Acid for Drug Delivery, Toxic Metal Ion Removal, and Fuel Cell Applications

et al. 2021

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In this study, a simple method for the fabrication of highly diffusive, adsorptive and conductive eco-friendly polyelectrolyte membranes (PEMs) with sulfonate functionalized pectin and poly(vinyl alcohol)(PVA) was established. The graft-copolymers were synthesized by employing the use of potassium persulfate as a free radical initiator from pectin (PC), a carbohydrate polymer with 2-acrylamido-2-methyl-1-propanesulphonic acid (AMPS) and sodium 4-vinylbenzene sulphonate (SVBS). The PEMs were fabricated from the blends of pectin graft-copolymers (PC-g-AMPS and PC-g-SVBS) and PVA by using a solution casting method, followed by chemical crosslinking with glutaraldehyde. The composite PEMs were fabricated by mixing phosphomolybdic acid with the aforementioned blends. The PEMs were successfully characterized by FTIR, XRD, SEM, and EDAX studies. They were assessed for the controlled release of an anti-cancer drug (5-fluorouracil) and the removal of toxic metal ions (Cu2+) from aqueous media. Furthermore, the composite PEMs were evaluated for fuel cell application. The 5-fluorouracil release capacity of the PEMs was found to be 93% and 99.1% at 300 min in a phosphate buffer solution (pH = 7.4). The highest Cu2+ removal was observed at 206.7 and 190.1 mg/g. The phosphomolybdic acid-embedded PEMs showed superior methanol permeability, i.e., 6.83 × 10−5, and 5.94 × 10−5, compared to the pristine PEMs. Furthermore, the same trend was observed for the proton conductivities, i.e., 13.77 × 10−3, and 18.6 × 10−3 S/cm at 30 °C.

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Castor oil and commercial thermoplastic polyurethane membranes modified with polyaniline: a comparative study

Cited by 29 publications

References 33 publications

A Solvent System Involved Fabricating Electrospun Polyurethane Nanofibers for Biomedical Applications

A Solvent System Involved Fabricating Electrospun Polyurethane Nanofibers for Biomedical Applications

Effect of alumina nanoparticles on the antifouling properties of polycarbonate‐polyurethane blend ultrafiltration membrane for water treatment

Fabrication of Polyelectrolyte Membranes of Pectin Graft-Copolymers with PVA and Their Composites with Phosphomolybdic Acid for Drug Delivery, Toxic Metal Ion Removal, and Fuel Cell Applications

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